| 2008 | 2009 | 2010 | 2011 |
Number of ultrasound examinations | 659 | 547 | 454 | 619 |
Number of detected NCOP | 83 | 84 | 76 | 142 |
NCOP, % | 12.6 | 15.4 | 16.7 | 22.9 |
Number of detected OFOP | 119 | 61 | 59 | 70 |
OFOP, % | 18.1 | 11.2 | 13.0 | 11.3 |
Daily milk production (kg) in NCOP cows | 36.9 | 37.9 | 37.9 | 38.2 |
Daily milk production (kg) in OFOP cows | 35.9 | 36.2 | 36.1 | 37.1 |